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| Male elk bugling during the fall rut. Large male elk are known as bulls. Male elk have large antlers which are shed each year. Male elk engage in competitive mating behaviors during the rut, including posturing, antler wrestling and bugling, a loud series of screams which is intended to establish dominance over other males and attract females. Image ID: 19693 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA | Bull elk spar to establish harems of females, Gibbon Meadow. Image ID: 13151 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, USA | Mule deer in tall grass, fall, autumn. Image ID: 19577 Species: Mule deer, Odocoileus hemionus Location: Yellowstone National Park, Wyoming, USA |
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| Adult female moose in deep meadow grass near Christian Creek. Image ID: 13039 Species: Moose, Alces alces Location: Christian Creek, Grand Teton National Park, Wyoming, USA | The bisons massive head is its most characteristic feature. Its forehead bulges because of its convex-shaped frontal bone. Its shoulder hump, dwindling bowlike to the haunches, is supported by unusually long spinal vertebrae. Over powerful neck and shoulder muscles grows a great shaggy coat of curly brown fur, and over the head, like an immense hood, grows a shock of black hair. Its forequarters are higher and much heavier than its haunches. A mature bull stands about 6 1/2 feet (2 meters) at the shoulder and weighs more than 2,000 pounds (900 kilograms). The bisons horns are short and black. In the male they are thick at the base and taper abruptly to sharp points as they curve outward and upward; the females horns are more slender. Image ID: 13120 Species: American bison, Bison bison Location: Yellowstone National Park, Wyoming, USA | Male elk bugling during the fall rut. Large male elk are known as bulls. Male elk have large antlers which are shed each year. Male elk engage in competitive mating behaviors during the rut, including posturing, antler wrestling and bugling, a loud series of screams which is intended to establish dominance over other males and attract females. Image ID: 19697 Species: Elk, Cervus canadensis Location: Madison River, Yellowstone National Park, Wyoming, USA |
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| Male elk bugling during the fall rut. Large male elk are known as bulls. Male elk have large antlers which are shed each year. Male elk engage in competitive mating behaviors during the rut, including posturing, antler wrestling and bugling, a loud series of screams which is intended to establish dominance over other males and attract females. Image ID: 19698 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA | Elk, bull elk, adult male elk with large set of antlers. By September, this bull elk's antlers have reached their full size and the velvet has fallen off. This bull elk has sparred with other bulls for access to herds of females in estrous and ready to mate. Image ID: 19721 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA | A male moose, bull moose, on snow covered field, near Cooke City. Image ID: 19680 Species: Moose, Alces alces Location: Yellowstone National Park, Wyoming, USA |
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| Roosevelt elk, adult bull male with large antlers. This bull elk has recently shed the velvet that covers its antlers. While an antler is growing, it is covered with highly vascular skin called velvet, which supplies oxygen and nutrients to the growing bone; once the antler has achieved its full size, the velvet is lost and the antler's bone dies. This dead bone structure is the mature antler, which is itself shed after each mating season. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest. Image ID: 25890 Species: Roosevelt elk, Cervus canadensis roosevelti Location: Redwood National Park, California, USA | Roosevelt elk, adult bull male with large antlers. This bull elk has recently shed the velvet that covers its antlers. While an antler is growing, it is covered with highly vascular skin called velvet, which supplies oxygen and nutrients to the growing bone; once the antler has achieved its full size, the velvet is lost and the antler's bone dies. This dead bone structure is the mature antler, which is itself shed after each mating season. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest. Image ID: 25878 Species: Roosevelt elk, Cervus canadensis roosevelti Location: Redwood National Park, California, USA | Maasai Giraffe, Maasai Mara National Reserve. Image ID: 29960 Species: Masai giraffe, Giraffa camelopardalis tippelskirchi Location: Maasai Mara National Reserve, Kenya |
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| Mixed Herd of Wildebeest and Zebra, aerial photo, Maasai Mara National Reserve, Kenya. Image ID: 29823 Species: Zebra, Equus quagga Location: Maasai Mara National Reserve, Kenya Pano dimensions: 1963 x 5760 | ||
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| Male elk bugling during the fall rut. Large male elk are known as bulls. Male elk have large antlers which are shed each year. Male elk engage in competitive mating behaviors during the rut, including posturing, antler wrestling and bugling, a loud series of screams which is intended to establish dominance over other males and attract females. Image ID: 19700 Species: Elk, Cervus canadensis Location: Madison River, Yellowstone National Park, Wyoming, USA | Bull elk in sage brush with large rack of antlers during the fall rut (mating season). This bull elk has sparred with other bulls to establish his harem of females with which he hopes to mate. Image ID: 19718 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA | Maasai Giraffe, Amboseli National Park. Image ID: 29563 Species: Masai giraffe, Giraffa camelopardalis tippelskirchi Location: Amboseli National Park, Kenya |
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| Hippopotamus, Meru National Park, Kenya. Image ID: 29663 Species: Hippopotamus, Hippopotamus amphibius Location: Meru National Park, Kenya | Waterbuck, Meru National Park, Kenya. Image ID: 29694 Species: Waterbuck, Kobus ellipsiprymnus Location: Meru National Park, Kenya | Maasai Giraffe, two males in courtship combat, jousting, Olare Orok Conservancy. Image ID: 30069 Species: Masai giraffe, Giraffa camelopardalis tippelskirchi Location: Olare Orok Conservancy, Kenya |
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| Wildebeest Herd, Maasai Mara National Reserve, Kenya. Image ID: 29782 Species: Wildebeest, Connochaetes taurinus Location: Maasai Mara National Reserve, Kenya | Bison herd. Image ID: 13000 Species: American bison, Bison bison Location: Grand Teton National Park, Wyoming, USA | Bison. Image ID: 13002 Species: American bison, Bison bison Location: Grand Teton National Park, Wyoming, USA |
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| Mother and calf moose wade through meadow grass near Christian Creek. Image ID: 13037 Species: Moose, Alces alces Location: Christian Creek, Grand Teton National Park, Wyoming, USA | Mother moose grazes in Christian Creek while its calf watches nearby. Image ID: 13038 Species: Moose, Alces alces Location: Christian Creek, Grand Teton National Park, Wyoming, USA | Mother moose grazes in Christian Creek while its calf watches nearby. Image ID: 13043 Species: Moose, Alces alces Location: Christian Creek, Grand Teton National Park, Wyoming, USA |
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| Pronghorn antelope, Lamar Valley. The Pronghorn is the fastest North American land animal, capable of reaching speeds of up to 60 miles per hour. The pronghorns speed is its main defense against predators. Image ID: 13080 Species: Pronghorn antelope, Antilocapra americana Location: Lamar Valley, Yellowstone National Park, Wyoming, USA | The Lamar herd of bison grazes, a mix of mature adults and young calves. Image ID: 13123 Species: American bison, Bison bison Location: Lamar Valley, Yellowstone National Park, Wyoming, USA | The Lamar herd of bison grazes, a mix of mature adults and young calves. Image ID: 13132 Species: American bison, Bison bison Location: Lamar Valley, Yellowstone National Park, Wyoming, USA |
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| A herd of bison grazes near the Lamar River. Image ID: 13145 Species: American bison, Bison bison Location: Lamar Valley, Yellowstone National Park, Wyoming, USA | Bull elk, antlers bearing velvet, Gibbon Meadow. Elk are the most abundant large mammal found in Yellowstone National Park. More than 30,000 elk from 8 different herds summer in Yellowstone and approximately 15,000 to 22,000 winter in the park. Bulls grow antlers annually from the time they are nearly one year old. When mature, a bulls rack may have 6 to 8 points or tines on each side and weigh more than 30 pounds. The antlers are shed in March or April and begin regrowing in May, when the bony growth is nourished by blood vessels and covered by furry-looking velvet. Image ID: 13154 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, USA | |
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